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Hacks & Security Rumor First seen

Post claims half of top 20 quantum-exposed BTC addresses are exchange wallets

A post on r/Bitcoin claims that half of the top 20 quantum-exposed bitcoin addresses belong to exchanges and custodians, holding about 1.06M BTC, based on a weekly scan of the UTXO set matched against public keys visible on-chain. It says the largest exposed balances are custodial cold wallets that reused addresses, citing Binance's largest address as having its key public since October 2018, and notes proof-of-reserves as a reason exchanges keep stable published addresses.

Why “Rumor”

  • Only community or trader posts: r/Bitcoin

0 independent source groups across 1 post · evidence score 9/100. How labels work

Market around the story

AssetPrice at first report6h before1h before1h after6h after1h move vs normal24h volume vs median
BTC $83,325 +0.09% −0.04% −0.37% +0.16% 1.0σ 1.0×

Returns are measured from the moment the story first appeared. “vs normal” compares the move with the asset's typical hourly move over the previous 30 days.

What the sources claim

  1. Half of the top 20 quantum-exposed bitcoin addresses belong to exchanges and custodians, holding roughly 1.06M BTC. BTC

    “Half of the top 20 quantum-exposed bitcoin addresses belong to exchanges and custodians, holding ~1.06M BTC”
    r/Bitcoin
  2. The largest exposed balances are custodial cold wallets that have reused the same address for years, not lost Satoshi coins. BTC

    “The biggest exposed balances aren’t lost Satoshi coins. They’re custodial cold wallets that have reused the same address for years.”
    r/Bitcoin
  3. Binance's largest address has had its key public since October 2018. BTC

    “Binance’s largest has had its key public since October 2018.”
    r/Bitcoin
  4. Proof-of-reserves is one reason exchanges keep stable, published addresses.

    “In their defense, proof-of-reserves is one reason exchanges keep stable, published addresses.”
    r/Bitcoin
  5. Receiving to a fresh address every time keeps your key hidden until you spend. BTC

    “receive to a fresh address every time, and your key stays hidden until you spend”
    r/Bitcoin

Sources

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Summary and claims extracted by AI with prompt analyze-story@5 on 2026-10-15 12:50 UTC. Labels are computed from the sources, not by the model.